Mostafa EL YASSA is a Professor of informatics at the Faculty of Sciences, University Ibn Zohr, Agadir, Morocco. He received a Doctorat in Informatics and Statistics in 1984 from Strasbourg University (France) and a Doctorat d'Etat es-Sciences degree in Pattern recognition by pretopologique approach from Faculty of sciences, University Ibn Zohr, in 2007. His research areas include: Pattern recognition, pretopologique approach, verification of Handwritten Signatures, image analysis and document processing.